The DIN571 Hex Head Wood Screw, also known as a coach screw or lag screw, is a high-strength fastening solution engineered for heavy-duty timber and composite constructions. Designed with a robust hexagonal head for maximum torque application, these screws ensure a secure, deep grip in natural stone, metal structures, and wooden beams, making them indispensable for industrial-grade structural assembly.
Manufactured from premium carbon steel and available in multiple grades (4.8 to 12.9), our DIN571 screws meet rigorous international standards including DIN, ISO, ANSI/ASTM, and JIS. With advanced heat treatment and diverse plating options, these fasteners provide exceptional shear strength and corrosion resistance, tailored to meet the demanding requirements of curtain walls, railings, and machinery support systems.
Detailed Parameters
| Material | Carbon Steel | Grade | 4.8, 8.8, 10.9, 12.9 etc. |
|---|---|---|---|
| Size Range | M6 - M12 | Standards | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS |
| Surface Finish | Plain, Black, Zinc Plated, HDG | Certification | ISO9001 |
| Heat Treatment | Tempering, Hardening, Spheroidizing | Process | Heading, Threading, Plating |
| Plating Thickness | Electroplate > 5μm / HDG > 50μm | Customization | OEM available (Drawing/Samples) |
Key Advantages
Superior Strength
Available in high-tensile grades up to 12.9, providing unmatched load-bearing capacity for structural supports.
Corrosion Resistance
Hot-dip galvanized and zinc-plated options ensure longevity even in humid or outdoor environments.
Global Standards
Strict adherence to DIN, ISO, and ANSI specifications guarantees seamless compatibility worldwide.
Versatile Application
Ideal for curtain walls, beam supports, machine frames, and heavy-duty timber construction.
Precision Engineering
Advanced threading and heading processes ensure a tight fit and smooth installation every time.
OEM Flexibility
Full customization support based on your specific drawings or samples to meet unique project needs.
Product Gallery
Management Platforms
Quality Control
ISO9001 certified production lines ensuring every batch meets strict dimensional tolerances.
Thermal Processing
Precision tempering and hardening to achieve exact grade specifications (4.8-12.9).
Surface Treatment
Professional electroplating and hot-dip galvanizing for maximum chemical resistance.
Custom Engineering
Rapid prototyping and OEM manufacturing based on customer technical drawings.
Logistics Mgmt
Flexible packaging solutions tailored to customer requirements for safe global shipping.
Material Sourcing
Strict vetting of carbon steel suppliers to ensure raw material purity and consistency.
Investment Return Comparison
| Feature | Standard Fasteners | Premium DIN571 Screws | Value Impact |
|---|---|---|---|
| Durability | Low/Medium | Extreme (HDG coated) | Reduced Maintenance |
| Load Capacity | Standard | High-Tensile (Up to 12.9) | Enhanced Safety |
| Installation Speed | Variable | High (Precision Thread) | Lower Labor Cost |
| Corrosion Life | Short-term | Long-term Protection | Extended Asset Life |
| Compliance | Basic | Multi-Standard (ISO/DIN) | Easy Certification |
Frequently Asked Questions
While often used interchangeably, coach screws typically refer to the DIN571 style with a hex head and partially threaded shank, specifically designed for heavy timber applications.
For heavy structural loads, we recommend Grade 8.8, 10.9, or 12.9 carbon steel, as these provide the necessary tensile strength to prevent shearing.
HDG provides a thicker protective layer (>50μm) compared to electroplating, offering superior protection against rust in outdoor or marine environments.
Yes, we provide comprehensive OEM services. We can manufacture screws according to your specific drawings or samples.
M12 screws are commonly used for heavy beam supports, mounting large brackets, and securing thick metal profiles to wooden bases.
Refer to our installation parameters: for example, M8 typically requires a hole of 5.0-5.2mm, while M12 requires 8.0-8.2mm for optimal grip.
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